You are right. It is quite normal for a man to get a second erection after he has ejaculated.
The second erection can happen in a few minutes. This is called the refractory period. During the refractory period, which follows orgasm and ejaculation, men cannot be restimulated to orgasm and ejaculation. Women do not have a refractory period, and may be stimulated to another orgasm immediately after having had one.
How long does the refractory period last? There's no standard waiting time. For some men, it's mere minutes before they can come again; for others, it takes hours, or even a good night's sleep. The length of the refractory period usually increases with age and differs from individual to individual and occasion to occasion.
For young men, the refractory period is usually shorter or seemingly nonexistent; for older men, it is longer. Also, some guys get soft during the refractory period, while others maintain erections.
Many things can affect the length of the refractory period, including:
• Alcohol and/or other drug use
• Interest in having sex at the moment
• Positioning during sex (for example, a man might find that his refractory period is shorter when having sex in a sexual position he prefers)
But Vish, do not compare with others. Especially in Porn, with the help of editing, it can appear that the man is ready for round two of intercourse seconds after orgasm. That's just not realistic for most men.
It is better to talk to your partner, so that she does not force you to get an erection immediately. Sex is not all about penetration. You can do other things without having an erect penis, like touching, kissing, or focusing on your partner.
Ejaculation happens when mature sperm, stored in the epididymis, a tightly coiled tube that leads from the testis, are pumped to the vas deferens (where the seminal vesicle supplies the seminal fluid), and then to the prostate; the prostate muscle opens and the prostate gland pumps the seminal fluid into the urethra and out the urethral opening.
At the time of ejaculation, most men orgasm. But ejaculation does not always occur with orgasm. Yoga helps where sexuality is heightened to get closer to enlightenment. Men can train themselves to experience continual peaks of pleasure (orgasm) without ejaculating, thereby apparently eliminating the need for a refractory period.